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Liquid penetrant testing
Revealing surface-breaking discontinuities on any non-porous material.
SR EN ISO 3452-1…6SR EN ISO 23277SR EN ISO 12706
How the method works
A coloured or fluorescent penetrant is applied to the cleaned surface and drawn into surface-breaking discontinuities by capillary action. After excess removal, a developer draws the trapped penetrant back out, forming a visible indication considerably wider than the actual defect.
What it detects
- Surface-breaking cracks
- Surface porosity and blowholes
- Laps and laminations
- Surface-breaking lack of fusion
- Through-wall leaks in thin sections
Typical applications
- Welded joints in austenitic stainless steel and aluminium
- Castings and forgings in non-ferromagnetic materials
- Pressure vessels and process piping
- Verification after machining
Reference standards
- SR EN ISO 3452-1…6
- SR EN ISO 23277
- SR EN ISO 12706
Equipment
- Magnaflux penetrant system
- SKC-S cleaner and remover
- SKL-WP2 penetrant
- SKD-S2 developer
A selection from the laboratory equipment.
Limitations
No method answers everything. We say up front where it stops, so we can pick the right technique for your job together.
- Detects surface-breaking defects only — internal defects remain invisible
- Not applicable to porous or highly absorbent materials
- The surface must be thoroughly degreased; oil or paint blocks penetration
- Penetration and development dwell times must be strictly observed to avoid false negatives